After reading the comments, I now understand why the marketing copy touts saving and open text files as a feature. Given that there is no mention of the web app (AFAICT) on this page and that I had never heard of Hemingway App before, I initially was very confused as to why, for a text editor, saving/opening files and editing text offline would even be worth mentioning. I'm not saying the copy is poorly written (in fact I think it's written quite well), I just think that perhaps not enough of it is directed at people like me. Maybe a simple link back to the web app and some text explaining it would suffice.
Also, a minor nitpick: I think the usage of "Hemingway App" and "Hemingway Editor" is a bit confusing. I take it the web app is Hemingway App, and the desktop client is Hemingway Editor? Why, then, is the page title "Hemingway App for Mac OSX"? (side note, no love for Windows in the title?)
Not sure why I chose this comment to be my very first comment on HN.